Adjustable holder



FIG. 1 is a perspective view of the adjustable holder showing a newornamental design therefor;

FIG. 2 is an enlarged front elevational view thereof with the rear viewbeing a mirror image;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken line showing of a portion of a structure is for illustrativepurposes only and forms no part of the claimed design.

The ornamental design for an adjustable holder, as shown.